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May 5, 2016

Erratum for “Resonance of Free-Surface Waves Provoked by Floodgate Maneuvers” by Ali Triki

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Publication: Journal of Hydrologic Engineering
Volume 21, Issue 7
Typos and erroneous figures in the final published version are clarified in this erratum. This paper was an advancement on the topic of resonance phenomenon in free-surface flow detailed in Triki and Hadj-Taïeb (2012), which inadvertently was not referenced. The author apologizes for any inconvenience and lack of explanation caused by this oversight.
Corrections to the original paper will be addressed first to ensure clarity, followed by a detailed description outlining the differences between the two papers, and finishing with a comparison to the contributions published in Triki and Hadj-Taïeb (2012).
The following corrections should be made to the original paper:
1.
In the “Numerical Solution” section (first paragraph), the sentence “…neglecting the Boussinesq term…” should read, “…neglecting the second order time-space derivative term [2(Q/A)/xt] of the Boussinesq term.”
2.
Eqs. (7) and (8), relating to the prediction and the correction steps of the numerical scheme, should read, respectively:
Wi*=Wik+σ(Fi+1kFik)+ΔtHik(i=1,,n)
(7)
Wi*=12(Wi*+Wik)+σ2(Fi*Fi1*)+Δt2Hi*(i=2,,n)
(8)
In this paper, the numerical discretization of the second-order space-derivative term [2(Q/A)/x2] of the Boussinesq term was achieved by using a three-point, central finite-difference approximation in both the predictor and corrector steps. However, the term {[(Q/A)/x]2} is approximated using a forward and backward finite-difference discretization in the predictor and in the corrector steps, respectively.
3.
In the “Analysis of Superposition of the Two Maneuvers” section (first paragraph), the maximum depth at the downstream should read: 10.285 m at t=1,109s for ω=ω0; and it is approximately 7.257 m at t=1,168s for ω=0.
4.
The pulsation value of wave-beat phenomenon, cited in the last paragraph of the “Resonance of Free Surface Waves” section and with the caption of Fig. 6, should read: ωbatt.=1.2ωres.
5.
Figs. 36 should be replaced by the corrected ones in this erratum.
6.
The reference (Triki and Hadj-Taïeb 2012) should be added in the “Introduction” section (last paragraph): “The early literature on resonance … opening and closing a valve (Triki and Hadj-Taïeb 2012).”
7.
The following reference should be added to the “Reference” section of the original paper:
Fig. 3. Comparison of depths evolutions with and without sinusoidal excitation
Fig. 4. Depths and velocities evolutions for the pulsation ωr=ω0 (resonance)
Fig. 5. Depths and velocities evolutions for the pulsation ωar=2ω0 (antiresonance)
Fig. 6. Depths and velocities evolutions for the pulsation ωbatt.=1.2×ω0 (battement)
Triki, A., and Hadj-Taieb, E., (2012). “Résonance des ondes de surface libre provoquée par les manoeuvres de vannes.” La Houille Blanche, (2), 55–61 (in French).
The author would like to assure readers that all results, discussions, and conclusions are maintained because the listed errors were the result of typos and uploaded figure errors. The remainder of the errata is on the basis of the above corrections.

Comparison with Triki and Hadj-Taïeb (2012)

The differences in investigation between this paper and Triki and Hadj-Taïeb (2012) are distinct in both computation and discussed test cases. The models used to predict the free-surface wave behavior in the two papers are (1) the Saint-Venant model (SVM) in Triki and Hadj-Taïeb (2012), and (2) a model on the basis of the Boussinesq assumption (BM) in this paper.
The use of the BM aimed to fairly predict the flow evolution on the basis of a more realistic assumption, inasmuch as to overcome the well-known limitation of the SVM in predicting fast transient events. The difference between the two figures corresponding to the resonance of free-surface wave section of both papers are the corrected Fig. 3 provided in this erratum, and Fig. 4 of Triki and Hadj-Taïeb (2012). For instance, it is clear that the depth curves plotted in Fig. 3 of this paper exceed 10 m, whereas the corresponding depths illustrated in Fig. 4 of Triki and Hadj-Taïeb (2012) are approximately 9 m.
Moreover, the battement pattern of free-surface waves presented in Fig. 6, predicted according to the BM, has been observed for a sine pulsation value equal to 1.2 times the fundamental pulsation (ωbatt.=1.2ωres), unlike the corresponding result, computed according to the SVM and illustrated in Fig. 6 of Triki and Hadj-Taïeb (2012), in which the battement phenomenon of wave pattern appeared for the sine pulsation value equal to be 3 times the fundamental one (ωbatt.=3ωres). This observation difference, issued from the two models, implies that the results on the basis of the BM meet well the physical concepts of the resonance phenomenon, unlike the corresponding results on the basis of the SVM, which shows a slight shift of sine pulsation value from the fundamental pulsation value when wave battlement behavior occurs. This proves the limitation of the SVM, illustrated previously, and consequently justifies that the BM deserves to be implemented to predict such fast transient events.
In addition to the test cases discussed in both papers, an additional scenario was addressed separately in the “Analysis of Superposition of the Two Maneuvers” section of this paper. This scenario was investigated further to highlight the relevance of multiple floodgate maneuvers to free-surface wave behavior.
Considering these comparisons, it is shown that the subsequent paper (Triki 2014) had significantly contributed to the earlier paper (Triki and Hadj-Taïeb 2012) on free-surface wave resonance from both computation and extreme event illustrations.

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Go to Journal of Hydrologic Engineering
Journal of Hydrologic Engineering
Volume 21Issue 7July 2016

History

Received: Nov 30, 2014
Accepted: Mar 4, 2016
Published online: May 5, 2016
Published in print: Jul 1, 2016
Discussion open until: Oct 5, 2016

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Engineering School of Sfax, Univ. of Sfax, B.P. 1173, 3038 Sfax, Tunisia. E-mail: [email protected]

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